.Contains() on a list of custom class objects

Question

I\'m trying to use the .Contains() function on a list of custom objects

This is the list:

List CartProducts = new Lis         


        

Answer 1

You need to implement IEquatable or override Equals() and GetHashCode()

For example:

public class CartProduct : IEquatable
{
    public Int32 ID;
    public String Name;
    public Int32 Number;
    public Decimal CurrentPrice;

    public CartProduct(Int32 ID, String Name, Int32 Number, Decimal CurrentPrice)
    {
        this.ID = ID;
        this.Name = Name;
        this.Number = Number;
        this.CurrentPrice = CurrentPrice;
    }

    public String ToString()
    {
        return Name;
    }

    public bool Equals( CartProduct other )
    {
        // Would still want to check for null etc. first.
        return this.ID == other.ID && 
               this.Name == other.Name && 
               this.Number == other.Number && 
               this.CurrentPrice == other.CurrentPrice;
    }
}